feat: initial ElasticWrapPanel.

src/Ursa.Themes.Semi/Controls/ElasticWrapPanel.axaml

@@ -0,0 +1,3 @@
+<ResourceDictionary xmlns="https://github.com/avaloniaui"
+                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
+</ResourceDictionary>

src/Ursa.Themes.Semi/Controls/_index.axaml

@@ -6,6 +6,7 @@
         <ResourceInclude Source="ButtonGroup.axaml" />
         <ResourceInclude Source="Divider.axaml" />
         <ResourceInclude Source="DualBadge.axaml" />
+        <ResourceInclude Source="ElasticWrapPanel.axaml" />
         <ResourceInclude Source="IPv4Box.axaml" />
         <ResourceInclude Source="KeyGestureInput.axaml" />
         <ResourceInclude Source="Loading.axaml" />

src/Ursa/Controls/ElasticWrapPanel.cs

@@ -0,0 +1,33 @@
+using Avalonia;
+using Avalonia.Controls;
+
+namespace Ursa.Controls;
+
+public class ElasticWrapPanel : Panel
+{
+    protected override Size MeasureOverride(Size availableSize)
+    {
+        var panelDesiredSize = new Size();
+
+        foreach (var child in Children)
+        {
+            child.Measure(availableSize);
+            panelDesiredSize = child.DesiredSize;
+        }
+
+        return panelDesiredSize;
+    }
+
+    protected override Size ArrangeOverride(Size finalSize)
+    {
+        foreach (var child in Children)
+        {
+            const double x = 50;
+            const double y = 50;
+
+            child.Arrange(new Rect(new Point(x, y), child.DesiredSize));
+        }
+
+        return finalSize;
+    }
+}